JP5309712B2 - Communication device, method of releasing confidentiality - Google Patents

Description

  The present invention relates to a communication device and a secret release method.

  As an example of the communication apparatus, for example, there is a mobile station that supports HSDPA (High Speed Downlink Packet Access).

  HSDPA is a wireless communication system that aims to increase the downlink data transmission rate (14 Mbps) and reduce delay in W-CDMA (Wideband Code Division Multiple Access) compliant with 3GPP (3rd Generation Partnership Project). Technologies such as coding, hybrid ARQ (HARQ: Hybrid Automatic Repeat reQuest), and Node B scheduling are employed.

  Further, in conventional W-CDMA, retransmission control is performed only in an RLC (Radio Link Control) layer, but in HSDPA, a retransmission control function is also implemented in a MAC (Medium Access Control) layer. As a result, the number of retransmission control operations in the RLC layer can be reduced, so that the data transmission processing can be speeded up and the transmission quality can be improved.

  In the protocol stack of HSDPA, sub-layer MAC-hs (Medium Access Control-HSDPA) is arranged in the MAC layer of a mobile terminal (UE: User Equipment) and a base station (Node-B). The retransmission control in the MAC layer is performed by this MAC-hs.

  The retransmission control function in MAC-hs includes HARQ processing and MAC-hs reorder processing functions.

  In the HARQ process, data that has been received in the past and failed to be decoded is held, and decoding is performed in combination with data that is retransmitted from the base station, and a delay associated with retransmission can be reduced.

  In the MAC-hs reordering process, when there is a mismatch between the order of transmission data on the transmission side (base station) and the order of reception data on the reception side (mobile terminal) due to retransmission in HARQ, RLC in the upper layer The received data is rearranged before being transferred to the layer.

  When there is a missing MAC-hs PDU (Protocol Data Unit) in the received data, the data received until the missing MAC-hs PDU is retransmitted from the base station is temporarily held in the memory. When the missing data is received, rearrangement with the MAC-hs PDU in the memory is performed, and the rearranged data in order is transferred to the RLC layer.

  Note that data rearrangement is performed by a sequence number (TSN: Transmission Sequence Number) that is order information allocated in the MAC layer of the base station for each MAC-hs PDU that is a data processing unit in MAC-hs.

  Further, in the RLC layer, the data transferred from the lower layer is rearranged for each RLC PDU which is a data processing unit in the RLC layer.

  Next, data concealment processing in W-CDMA will be described.

  Transmission data concealment processing, that is, data encryption or decryption, is performed in the MAC layer for logical channel data that uses the transparent mode in the RLC layer, and the confirmation mode (AM: Acknowledged Mode). Alternatively, the RLC layer is used for logical channel data using the unacknowledged mode (UM).

  For example, as shown in FIG. 1, the concealment process in the RLC layer includes a concealment key (CK: Cipher Key), COUNT-C indicating a concealment sequence number, BEARER as a logical channel identifier, and uplink / downlink transmission directions. This is performed by performing an exclusive OR operation on the mask data (KEYSTREAM BLOCK) calculated using a secret parameter such as DIRECTION indicating the length of the mask data and LENGTH indicating the length of the mask data, and the payload (PLATEXT) of the RLC PDU. (Non-Patent Document 1).

  The secret parameters other than the secret sequence number can be updated at any time by negotiation between higher layers in the mobile terminal and the base station.

  On the other hand, the change of the HFN (HyperFrame Number) constituting the secret sequence number is performed by RLC-RESET (update request) on the RLC protocol generated in response to a request from RRC (Radio Resource Control), and the mobile terminal or base It is stipulated that the largest value handled by the station that requested RESET among the stations is set.

  In downlink communication, an RLC-RESET is transmitted from the mobile station to the base station, and an RLC-RESET-ACK (update request response) is returned from the base station to the mobile station in response to this, whereby the mobile station-base station The base station applies the updated secrecy parameter to the data after transmitting the RLC-RESET-ACK, and the mobile station also applies the data to the data after receiving the RLC-RESET-ACK. The updated secret parameter is applied.

  The data (CIPHERTEXT) concealed (encoded) on the transmission side is exclusive to the mask data calculated using the concealment parameter corresponding to the above-described concealment parameter used in the concealment process on the transmission side. It is concealed (decoded) again by performing a logical operation.

  Therefore, when a large number of data accumulated for data rearrangement in the MAC layer in accordance with the above-described MAC-hs retransmission control is collectively transferred to the RLC layer, it is necessary to temporarily release the concealment in the RLC layer. Since the amount of calculation increases and the processing load increases, there is a problem that processing is delayed.

Therefore, for example, Patent Document 1 and Patent Document 2 describe a technique aiming to reduce processing load and prevent delay in the RLC layer by performing the concealment release processing that has been conventionally performed in the RLC layer also in the MAC layer. Has been.
JP 2006-352490 A JP 2003-318800 A 3GPP TS33.105 V3.8.0

  When the data order is rearranged in the order of transmission in MAC-hs and the data is transferred to the confidential processing unit to the confidential processing unit, the data to be rearranged is held in the memory until the rearrangement is performed, and processing delay occurs. This increases the amount of memory in the MAC layer.

  Therefore, there is means for avoiding this problem by performing the data deciphering process in the MAC layer as described above. However, when the deciphering process is performed without performing the MAC-hs reorder process, the following problem occurs.

  That is, when a MAC-hs PDU including an RLC PDU of RLC-RESET-ACK becomes a communication error, the data concealed by the updated confidential parameter is received before the MAC-hs PDU is retransmitted. Although it will be received, it is unclear whether or not the secret parameter has been updated.

  Here, in the MAC layer, when the data concealed with the updated concealment parameter is released with the concealment parameter before the update, the data mismatch occurs and there is no way to cure it, so in the upper layer Since retransmission processing is necessary, the processing load and processing delay in the upper layer increase, and the amount of memory also increases.

  Such a problem may also occur in other communication systems in which confidential parameters are updated.

  Therefore, an object of the present invention is to appropriately cope with the update of the secret parameter.

According to one aspect of the present invention , when the received data concealed by the updated confidentiality parameter is released from the confidentiality parameter before the update, the received data that has been released from the confidentiality is changed to the confidentiality before the update. A concealment processing unit that performs concealment using a parameter and performs concealment release processing using the updated concealment parameter, and the concealment release by the concealment parameter before update by the concealment processing unit releases concealed data The present invention relates to a communication apparatus characterized in that it is performed on received data having order information indicating that it is later than the order information of the missing data .

  In another aspect of the present invention, before detecting that the received data order information is lost, the received data is sequentially deciphered using the security parameter before update, and when the lost data is detected, The received data having the order information indicating that it is later than the order information of the received data is temporarily retained, and the updated confidentiality parameter is applied to the retained data by receiving the missing data. When it is detected, a process for releasing the confidentiality of the retained data by the updated confidentiality parameter is performed.

  According to the present invention, it is possible to appropriately cope with the update of the confidential parameter.

  For example, according to one aspect of the present invention, even if the reception data concealed by the updated concealment parameter has been deconcealed by the concealment parameter before update, the concealment is performed again by the concealment parameter before update, Moreover, it is possible to perform an appropriate data deciphering process by deciphering with the updated secrecy parameter.

  According to another aspect of the present invention, the received data concealed by the updated concealment parameter is temporarily held without releasing the concealment until the concealment parameter update request response is received, and the update request It is possible to perform an appropriate data deciphering process by deciphering with the updated secrecy parameter after receiving the response.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(1) Configuration of Example In this example, a mobile terminal is shown as an example of a communication device. Of course, other communication devices such as a base station can be used.

  FIG. 2 is a diagram for explaining the flow of received data deciphering processing in a mobile terminal.

  In the figure, 1 is a layer 1 processing unit, 2 is a MAC-hs reorder memory, 3 is a MAC-hs reorder processing unit, 4 is a MAC-d processing unit, 5 is a secret operation unit, 6 is an RLC memory, and 7 is an RLC process. Indicates the part.

  The layer 1 processing unit 1 performs processes such as demodulation, despreading, mapping from a physical channel to a transport channel, and channel decoding on received data.

  The MAC-hs reorder memory 2 is a memory for temporarily holding a MAC-hs PDU for MAC-hs reorder processing.

  The MAC-hs reorder processing unit 3 performs a reorder process for rearranging the MAC-hs PDU received by retransmission and the MAC-hs PDU received in the past held in the MAC-hs reorder memory in the order of TSN.

  The MAC-d processing unit 4 gives the data transferred from the MAC-hs reorder processing unit 3 (data developed in the MAC-d PDU in the MAC-hs PDU disassembly function not shown) to an individual logical channel.

  For example, the concealment calculation unit 5 performs an exclusive logical operation on the received data in RLC PDU units and the mask data calculated using the set concealment parameter. As a result, the data concealed by the upper station is released.

  In the following description, both concealment (encoding) and deprivation (decoding) may be referred to as concealment processing.

  The RLC memory 6 stores the data that has been deciphered in the cipher operation unit 4.

  The RLC processing unit 7 performs retransmission control, RLC reorder processing, and the like on the received data stored in the RLC memory. The normal received data may be used as source data for data displayed on the display unit or may be used for other processing.

  In such a configuration, after reorder processing is performed in MAC-hs, the confidentiality is released and sent to the RLC processing unit. If the received data is missing, the start of the concealment process is delayed, and the reception data is sent to the RLC processing unit later. Further, by providing memory for holding data in both the MAC layer and the RLC layer, an increase in the overall physical memory may be caused, and processing delay may occur.

  Therefore, in this embodiment, it is possible to perform the deciphering process even before a predetermined number of received data is prepared. That is, in the embodiment of the present invention, the MAC-hs may not perform the reorder process, or may limit the period during which the reorder process is performed.

  In connection with the above, in the present embodiment, for example, when the reception data concealed by the updated concealment parameter is deciphered by the concealment parameter before update, the concealed reception data is converted into the concealment parameter before update. A concealment processing unit is provided that performs concealment again by the above-described method and performs a process of canceling concealment using the updated concealment parameter.

  In addition, for example, the reception data concealed by the confidential parameter before update is released from the confidential parameter before update without being held in the memory, and the reception data concealed by the confidential parameter after update is updated. A concealment processing unit is provided that temporarily holds the request response until detection of reception of the request response, and holds the update request response after detecting reception of the update request response to release the concealment by the updated concealment parameter. I will do it.

  The configuration of this embodiment is shown in FIG.

  In the figure, 8 is a layer 1 processing unit, 9 is a MAC-d processing unit, 10 is a monitoring unit, 11 is a confidential processing unit, and 12 is an RLC processing unit.

  The layer 1 processing unit 8 and the RLC processing unit 12 perform the same processes as the layer 1 processing unit 1 and the RLC processing unit 7 in FIG. 2, respectively.

  The MAC-d processing unit 9 gives the data transferred from the layer 1 processing unit 8 to an individual logical channel and sends the data to the concealment processing unit 11.

  The monitoring unit 10 monitors the TSN of the MAC-hs PDU transferred to the MAC-d processing unit 9 and transmits an RLC-RESET (update request) transmitted to the base station and an RLC-RESET-ACK received from the base station. (Update request response) is monitored.

  When detecting the RLC-RESET included in the transmission data, the monitoring unit 10 monitors the order information (for example, TSN) included in the header portion of the MAC-hs PDU transferred to the MAC-d processing unit 9, and performs the monitoring. Information is sent to the concealment processing unit 11.

  The concealment processing unit 11 may include a concealment calculation function and a memory.

  The concealment processing unit 11 performs processing for releasing the concealment of the RLC PDU included in the MAC-hs PDU sent from the MAC-d processing unit 9, and holds the processed MAC-hs PDU in the memory.

  When the concealment processing unit 11 acquires the monitoring information from the monitoring unit 10, based on the monitoring information, the concealment parameter before the update for the MAC-hs PDU having a TSN smaller than the MAC-hs PDU including the RLC-RESET-ACK. The secret release processing is performed using. For the MAC-hs PDU having a larger TSN than the MAC-hs PDU including the RLC-RESET-ACK, the deciphering process is performed using the updated confidential parameter. Even when the MAC-hs PDU having a larger TSN than the MAC-hs PDU including the RLC-RESET-ACK is decrypted using the pre-update secret parameter, the MAC-hs PDU is concealed again using the pre-update secret parameter, In addition, the deciphering process is performed based on the updated concealment parameter.

  The RLC processing unit 12 performs retransmission control, RLC reorder processing, and the like on the data held in the memory of the confidential processing unit 11.

  FIG. 4 is a sequence diagram showing the flow of the concealment process in the present embodiment.

  In the figure, the RLC layer and the MAC layer indicate the RLC sublayer and the MAC sublayer of the mobile terminal, and the counter RLC indicates the RLC sublayer of the base station, for example.

  In S1, RLC-RESET is transmitted from the mobile terminal to the base station.

  In S2 and S3, the mobile terminal receives MAC-hs PDUs with TSN = 1 and TSN = 2 transmitted from the base station, respectively.

  In S4, when an error occurs when a MAC-hs PDU of TSN = 3 including RLC-RESET-ACK is transmitted from the base station to the mobile terminal, the MAC-hs of the mobile terminal includes the RLC-RESET-ACK. A retransmission request for MAC-hs PDU is made by transmitting a NACK signal to the base station.

  In S5 and S6, the mobile terminal receives MAC-hs PDUs with TSN = 4 and TSN = 5 transmitted from the base station, respectively.

  In S7, TSN = 3 MAC-hs PDU including RLC-RESET-ACK retransmitted by the MAC-hs retransmission request is received.

  In S8, the confidential parameter used for the confidential processing in the mobile terminal is updated.

  Here, the TSN = 1 and TSN = 2 MAC-hs PDUs having a TSN value smaller than the MAC-hs PDU including the RLC-RESET-ACK are concealed and transmitted by the base station using the pre-update secret parameter. The On the other hand, TSN = 4 and TSN = 5 MAC-hs PDUs, which have a larger TSN value than MAC-hs PDUs including RLC-RESET-ACK, are concealed and transmitted by the base station using the updated secret parameters. .

  Therefore, also in the mobile terminal, the MAC-hs PDU with TSN = 1 and TSN = 2 uses the secret parameter before update, and the MAC-hs PDU with TSN = 4 and TSN = 5 uses the secret parameter after update. It is necessary to release the secrecy using each.

  Therefore, in one aspect of the present embodiment, the MAC-hs PDUs with TSN = 1 to 5 are deciphered using the pre-update secret parameter, and MAC-hs PDUs with TSN = 4 and TSN = 5 are necessary. In response to this, the concealment is performed again using the concealment parameter before update, and the concealment is canceled using the concealment parameter after update.

  Further, in another aspect of the present embodiment, the TSN = 1 and TSN = 2 MAC-hs PDUs with no missing TSN proceed with the ciphering process with the secrecy parameters before the update, and the TSN is missing. For MAC-hs PDUs with TSN = 4 and TSN = 5 that have skipped numbers in the TSN, the concealment process is temporarily held and held in the memory, and the concealment parameter is updated and concealed using the updated concealment parameter. To release.

In this embodiment, the case where the TSN is used as the order information indicating the transmission order of the MAC-hs PDU has been described. However, the present invention is not limited to this, and an identifier or the like indicating another order may be used as the order information. Is possible. The same applies to the detailed description of the following embodiments.
(2) First Aspect of Embodiment FIG. 5 is a diagram for explaining the outline of the concealment process in the first aspect of the embodiment of the present invention.

  When retransmission is not performed in Layer 1 or reorder processing is performed in MAC-hs, the MAC-hs PDU is deciphered in the order of TSN, so that TSN = 1 including RLC-RESET-ACK Up to RLC PDUs 1) and 2) included in the MAC-hs PDU, TSN = 2 after the TSN = 1 MAC-hs PDU including the confidential parameters before update and RLC-RESET-ACK (the TSN number is larger) The RLC PDUs 3) to 5) included in the MAC-hs PDUs of the MAC-hs PDUs are deciphered using the pre-update secrecy parameters.

  On the other hand, when reorder processing is not performed in MAC-hs in the middle of the figure, MAC-hs PDU with TSN = 2 is concealed earlier than MAC-hs PDU with TSN = 1. The RLC PDUs 3) to 5) to be deciphered with the secrecy parameters are also deciphered with the secrecy parameters before update. Therefore, the RLC PDUs 3) to 5) are not properly deciphered.

  Therefore, in the present embodiment at the bottom of the figure, an apparent reordering process is performed in the RLC memory and a concealment process is performed again. That is, for the RLC PDUs 3) to 5) that are not correctly deciphered in the middle example, the RLC PDUs 3) to 5) are concealed again using the pre-update concealment parameter, and in addition, the concealment is unconfined using the updated concealment parameter. As a result, it is possible to appropriately release the secrecy of the RLC PDUs 3) to 5).

  FIG. 6 shows a block diagram of the first mode of the embodiment of the present invention.

  In the figure, 10a is a monitoring unit, 11a is a concealment processing unit, 13a is a concealment calculation unit, and 14a is an RLC memory. In addition, the same code | symbol is attached | subjected to the part which overlaps with FIG. 3, and description is abbreviate | omitted.

  In the aspect of the present embodiment, the concealment processing unit 11a includes a concealment calculation unit 13a and an RLC memory 14a.

  The monitoring unit 10a monitors the TSN of the MAC-hs PDU that is sequentially transferred to the MAC-d processing unit 9, and when the transmission of the RLC-RESET is detected, the monitoring unit 10a is subsequently transferred to the MAC-d processing unit 9. Store TSN of MAC-hs PDU.

  When detecting the RLC-RESET ACK, the monitoring unit 10a compares the TSN of the MAC-hs PDU including the RLC-RESET ACK with the stored TSN.

  The monitoring unit 10a sends monitoring information including the comparison result to the confidential processing unit 11a.

  The concealment processing unit 11a performs concealment processing of the data processed by the MAC-d processing unit 9 based on the monitoring information acquired from the monitoring unit 10a.

  The cipher operation unit 13a is an exclusive logical operation of RLC PDU included in data sent from the MAC-d processing unit 9 or data held in the RLC memory and mask data calculated using the concealment parameter. By performing the above, the RLC PDU is concealed. The processed data is transferred to the RLC memory 14a.

  The secrecy calculation unit 13a cancels the secrecy for the MAC-hs PDU of the TSN having a larger number than the TSN of the MAC-hs PDU including the RLC-RESET-ACK using the secrecy parameter before update before detecting the RLC-RESE-ACK. If the monitoring information indicating that the RLC-RESET-ACK has been detected is acquired from the monitoring unit 10a even if it has been transferred to the RLC memory 14a, the MAC-hs PDU held in the RLC memory 14a is obtained. Then, the process of concealing again with the confidential parameter before update and releasing the confidentiality using the updated confidential parameter is executed.

  The RLC memory 14a holds the data transferred from the secret calculation unit 13a. The RLC memory 14a may also serve as a memory provided in a conventional RLC layer.

  As described above, even when the MAC-hs PDU including the RLC-RESET-ACK is retransmitted due to a communication error or the like and the received data order is inconsistent, that is, the received data is lost, it is transmitted after the RLC-RESET-ACK. The RLC PDU included in the MAC-hs PDU that has been released is deciphered with the pre-update secrecy parameter, then is secrecy with the pre-update secrecy parameter, and is also deciphered with the post-update secrecy parameter Therefore, it is possible to appropriately perform data deciphering.

Further, in the aspect of the present embodiment, since the MAC-hs PDU may perform the process of releasing the confidentiality of the received data without performing the reorder process with the MAC-hs, the processing delay is prevented, and further, as shown in FIG. MAC-hs reorder memory may not be provided (shares functions with RLC memory).
(3) Second Aspect of Embodiment FIG. 7 shows a block diagram in a second aspect of the present embodiment.

  In the figure, 10b is a monitoring unit, 11b is a secret processing unit, 13b is a secret calculation unit, 14b is an RLC memory, 15 is a reserved memory, and 16 is a selector. In addition, the same code | symbol is attached | subjected to the part which overlaps with FIG. 3, and description is abbreviate | omitted.

  In the aspect of the present embodiment, the concealment processing unit 11b includes a holding memory 15, a selector 16, a concealment calculation unit 17, and an RLC memory 18.

  The monitoring unit 10b monitors the TSN of the MAC-hs PDU sequentially transferred to the MAC-d processing unit 9, and sends the monitoring information to the confidential processing unit 11b.

  However, the monitoring of the TSN may be always performed, or the MAC-d processing unit 9 between the time when the monitoring unit 10b detects the transmission of the RLC-RESET and the time when the reception of the RLC-RESET ACK is detected. It is good also as performing about MAC-hs PDU transferred to. Further, when it is detected that the received data is missing after the monitoring unit 10 detects the transmission of the RLC-RESET and detects the reception of the RLC-RESET ACK, the monitoring unit 10 receives the missing data. The TSN may be monitored for the MAC-hs PDU transferred to the MAC-d processing unit 9 until detection.

  The concealment processing unit 11b performs concealment processing of the data processed by the MAC-d processing unit 9 based on the monitoring information acquired from the monitoring unit 10b.

  The hold memory 15 holds the MAC-hs PDU transferred from the MAC-d processing unit 9 based on the monitoring information of the monitoring unit 10b after the RLC-RESET transmission, and also holds the held MAC-hs PDU. Send to selector 16.

  The selector 16 performs switching based on the monitoring information of the monitoring unit 10b so that the data is transferred from either the MAC-d processing unit 9 or the holding memory 15 to the cipher calculation unit 13b.

  The cipher operation unit 13b is an exclusive logical operation between the RLC PDU included in the data sent from the MAC-d processing unit 9 or the holding memory 15 via the selector 16 and the mask data calculated using the concealment parameter. By performing the above, the RLC PDU is concealed. In calculating the mask data, the confidential parameter before or after updating is used based on the monitoring information of the monitoring unit 10b. The processed data is transferred to the RLC memory 14b.

  The RLC memory 14b holds the data transferred from the secret calculation unit 13b. The RLC memory 14b may also serve as a memory provided in the conventional RLC.

  Hereinafter, the operation of the confidential processing unit 11b based on the monitoring information in the monitoring unit 10b will be specifically described.

  After the RLC-RESET transmission is detected by the monitoring unit 10b, when the TSNs of the MAC-hs PDU transferred to the MAC-d processing unit 9 are continuous (the TSN is not missing), the MAC-d processing unit The data processed in 9 is transferred to the cipher operation unit 13b via the selector 16, and is concealed using the pre-update secrecy parameter and then delivered to the RLC memory 14b.

  On the other hand, after the RLC-RESET transmission is detected by the monitoring unit 10b, the MAC-d processing unit 9 does not recognize the MAC-hs PDU TSN transferred before receiving the MAC-hs PDU including the RLC-RESET-ACK. When the reception of missing data is detected continuously, that is, the MAC-hs PDU transferred to the MAC-d processing unit 9 is subsequently sent to the holding memory 15 until the reception of the missing data is detected. Refrain from executing the process.

  When the monitoring unit 10b detects the reception of the missing data and confirms that the missing data is not RLC-RESET-ACK, the MAC-hs PDU held in the hold memory 15 is updated by the secret calculation unit 13b. The secret is released by the previous secret parameter and transferred to the RLC memory 14b.

  On the other hand, when the monitoring unit 10b detects reception of the MAC-hs PDU including the RLC-RESET-ACK, the monitoring unit 10b compares the TSN of the MAC-hs PDU with the TSN of the MAC-hs PDU held in the hold memory 15. Then, the data transmission order in the base station is specified.

  The comparison result is sent from the monitoring unit 10b to the concealment processing unit 11b, and the MAC-hs PDU having a TSN with a smaller number than the TSN of the MAC-hs PDU including the RLC-RESET-ACK, that is, the RLC-RESET at the base station The data specified to be transmitted before the ACK is concealed by the concealment calculation unit 13b using the concealment parameter before update, and then transferred to the RLC memory 14b.

  Further, the MAC-hs PDU having a TSN having a larger number than the TSN of the MAC-hs PDU including the RLC-RESET-ACK, that is, data specified to be transmitted after the RLC-RESET-ACK in the base station Is concealed by the updated concealment parameter by the concealment calculation unit 13b and then transferred to the RLC memory 14b.

  As described above, even when the MAC-hs PDU including the RLC-RESET-ACK is retransmitted due to a communication error or the like and the received data order is inconsistent, that is, the received data is lost, the RLC-RESET-ACK is preceded by the RLC-RESET-ACK. For the RLC PDU included in the transmitted MAC-hs PDU, the MAC-hs transmitted after the RLC-RESET-ACK is used according to the confidential parameter before update without performing a predetermined number of accumulation processes by buffering. Since the RLC PDU included in the PDU is deciphered by the updated secrecy parameter, it is possible to appropriately decipher the data.

  Further, in the aspect of this embodiment, the MAC-hs PDU reordering process in MAC-hs is a period from detection of occurrence of missing data to detection of reception of the retransmitted missing data after transmission of RLC-RESET. However, since it is possible to perform the deciphering process on the received data sequentially outside the period, the processing delay is prevented and the memory (holding memory 15) required for the process is obtained from the MAC-hs reorder memory as shown in FIG. Can also be reduced.

Concealment processing in RLC specified by 3GPP. Flow of confidential processing of received data in a conventional mobile terminal. The structure of the Example of this invention. The sequence diagram which shows the flow of the concealment process in a present Example. The outline | summary of the concealment process in the 1st aspect of an Example. The block diagram in the 1st aspect of an Example. The block diagram in the 2nd aspect of an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 8 Layer 1 process part 2 MAC-hs reorder memory 3 MAC-hs reorder process part 4, 9 MAC-d process part 5, 13a, 13b Secret operation part 6, 14a, 14b RLC memory 7, 12 RLC process part 10 10a, 10b Monitoring unit 11, 11a, 11b Confidential processing unit 15 Reserved memory 16 Selector

Claims (5)

When the received data concealed by the updated concealment parameter is deciphered by the concealment parameter before update, the concealed release data is concealed by the concealment parameter before update, and A secrecy processing unit that performs a process of canceling secrecy using the updated secrecy parameter, and the secrecy cancellation by the secrecy parameter before update by the secrecy processing unit is performed before the lost data is deciphered. The communication apparatus is characterized in that it is performed on received data having order information indicating that it is later than the order information . In claim 1,
The updated concealment parameter is applied to the received data having order information indicating that the processing by the concealment processing unit is later than the order information of the missing data due to the reception of the missing data. When it is detected that the received data has order information indicating that it is later than the order information of the missing data,
A communication device. In claim 1,
When it is detected by reception of the missing data that the confidential parameter before update is applied to received data having order information indicating that it is later than the order information of the missing data In addition, the processing by the confidential processing unit is not performed.
A communication device. In claims 1 to 3,
The communication device is a wireless mobile terminal. A method of canceling concealment applied to a communication device,
The communication device is
When the received data concealed by the updated concealment parameter is deciphered by the concealment parameter before update, the concealed release data is concealed by the concealment parameter before update, and Received data having sequence information indicating that the deciphering is performed with the updated secrecy parameter, and the deciphering is later than the sequence information of the missing data before deciphering the missing data A method of canceling concealment, characterized in that

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